linux-kernel - [PATCH v2 2/2] fpga: zynq-fpga: use 'time_left' variable with wait_for_completion

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Date: Thu, 20 Jun 2024 13:50:22 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: linux-kernel@...r.kernel.org
Cc: Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Michal Simek <michal.simek@....com>,
	Moritz Fischer <mdf@...nel.org>,
	Wu Hao <hao.wu@...el.com>,
	Xu Yilun <yilun.xu@...el.com>,
	Tom Rix <trix@...hat.com>,
	linux-fpga@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 2/2] fpga: zynq-fpga: use 'time_left' variable with wait_for_completion_timeout()

There is a confusing pattern in the kernel to use a variable named
'timeout' to store the result of wait_for_completion_timeout() causing
patterns like:

        timeout = wait_for_completion_timeout(...)
        if (!timeout) return -ETIMEDOUT;

with all kinds of permutations. Use 'time_left' as a variable to make
the code self explaining.

Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Acked-by: Michal Simek <michal.simek@....com>
---

Change since v1: added ack (Thanks Michal)

 drivers/fpga/zynq-fpga.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/fpga/zynq-fpga.c b/drivers/fpga/zynq-fpga.c
index 0ac93183d201..4db3d80e10b0 100644
--- a/drivers/fpga/zynq-fpga.c
+++ b/drivers/fpga/zynq-fpga.c
@@ -387,7 +387,7 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt)
 	const char *why;
 	int err;
 	u32 intr_status;
-	unsigned long timeout;
+	unsigned long time_left;
 	unsigned long flags;
 	struct scatterlist *sg;
 	int i;
@@ -427,8 +427,8 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt)
 	zynq_step_dma(priv);
 	spin_unlock_irqrestore(&priv->dma_lock, flags);
 
-	timeout = wait_for_completion_timeout(&priv->dma_done,
-					      msecs_to_jiffies(DMA_TIMEOUT_MS));
+	time_left = wait_for_completion_timeout(&priv->dma_done,
+						msecs_to_jiffies(DMA_TIMEOUT_MS));
 
 	spin_lock_irqsave(&priv->dma_lock, flags);
 	zynq_fpga_set_irq(priv, 0);
@@ -452,7 +452,7 @@ static int zynq_fpga_ops_write(struct fpga_manager *mgr, struct sg_table *sgt)
 
 	if (priv->cur_sg ||
 	    !((intr_status & IXR_D_P_DONE_MASK) == IXR_D_P_DONE_MASK)) {
-		if (timeout == 0)
+		if (time_left == 0)
 			why = "DMA timed out";
 		else
 			why = "DMA did not complete";
-- 
2.43.0